spring mvc controller中获取request head内容

spring mvc controller中获取request head内容：

@RequestMapping("/{mlid}/{ptn}/{name}")
 public String print(@PathVariable Integer mlid, @PathVariable String ptn, @PathVariable String name, HttpSession session, Model model,
@RequestHeader String referer,
@RequestHeader ("Referer") String referer2,
@RequestHeader ("host") String hostName,
@RequestHeader ("Accept") String acceptType,
@RequestHeader ("Accept-Language") String acceptLang,
@RequestHeader ("Accept-Encoding") String acceptEnc,
@RequestHeader ("Cookie") String cookie,
@RequestHeader ("User-Agent") String userAgent,
HttpServletRequest request) {
        System.out.println(hostName);
//        if (referer == null) {
//            return "common/blank";
//        }
        String header = request.getHeader("Referer");
        String header2 = request.getHeader("referer");
        System.out.println(header);
        System.out.println(header2);

@RequestHeader String referer,就是@RequestHeader ("Referer") String referer2,  变量referer的名字不能随便改，就是找的request header的referer；如果请求中没有referer，前台会报400异常，需要捕获；后台会有org.springframework.web.bind.ServletRequestBindingException: Missing request header ‘referer3‘ for method parameter of type String可以使用request.getHeader("Referer");或者request.getHeader("referer");这样可以进行null判断。